There is nothing south of the South Pole, in much the same way there was no time or space before time or space existed (in our understanding of it) before the Big Bang.
This means that anything that preceded it can not be applied to our understanding of time and existence.
For Hawking, however, imaginary time "behaves like a fourth direction of space". This means that the Universe, according to Hawking, has no boundaries.
"Not just Hawking's model but all cosmological models seeking to avoid the need for a transcendent Causal Agent for the universe (aka God) require that the quantum space-time fluctuations during the quantum gravity era (the era when the universe is smaller than the diameter of an electron) must be large", explained Ross.
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Essentially, there was no conceivable "boundary" of time until the Big Bang. "The boundary condition of the universe ... is that it has no boundary", he told Tyson, who himself is also a physicist. "It just seemed that way from mankind's perspective", Hawking said, hinting that a lot of what we believe is derived from a human-centric perspective, which might limit the scope of human knowledge of the world.
During the show, Hawking argued that before the Big Bang, real ordinary time was replaced by imaginary time and was in a bent form.
Hawking uses the concept of Euclidean space-time to describe his theory.
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Professor Hawking then explains that the best way to picture this reality is by thinking of imaginary time and real time beginning at our Earth's South Pole.
'There is nothing south of the South Pole, so there was nothing around before the Big Bang, ' he said. As per Euclid, the imaginary time works like a four-dimensional curved surface of the Earth but it has two extra dimensions.
Instead, time and existence fans out from a single point, like the degrees of latitude on planet Earth.
About 13.7 billion years ago, our Universe was born in a extremely dense point of heat and energy, no bigger than an atom. "Even the amount of matter in the universe, can be different to what it was before the Big Bang, as the Law of Conservation of Matter, will break down at the Big Bang". Moving further, he also dictated how time was distorted during the period of singularity where it was reaching closer to "nothing" but never become it.
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